My heart goes out to you and I am so,so sorry for your loss. You are so blessed to have had such a good relationship with your mother.
Hopefully someone out there that has been putting off going to the doctor will be encouraged to go. I was only 39 when diagnosed with colon polyps and have had regular colonoscopies ever since. The test is not bad at all and is well worth having.
Again, my deepest sympathy to you and your Dad.